RW 310-PP Series onboard load scale offers precise axle group weight measurements for single, tandem, or tri-axle vehicles. It features a 3.5" analog gauge for easy readability, and its durable polypropylene enclosure ensures longevity. Installation is simple, involving mounting the gauge, connecting to the vehicle's air suspension, and calibrating using a certified in-ground scale. The scale aids in preventing overloading, optimizing load distribution, and increasing fuel efficiency.
RW 310-PP Series onboard load scale offers precise axle group weight measurements for single, tandem, or tri-axle vehicles. It features a 3.5" analog gauge for easy readability, and its durable polypropylene enclosure ensures longevity. Installation is simple, involving mounting the gauge, connecting to the vehicle's air suspension, and calibrating using a certified in-ground scale. The scale aids in preventing overloading, optimizing load distribution, and increasing fuel efficiency.
ONBOARD LOAD SCALE
EXTERIOR ANALOG | 310-PP Series
WELCOME
2
Thank you for choosing to drive more and scale less! Here at Right
Weigh, we are commied to making our products simple to install
and easy to use. We understand that installaon can vary between
vehicles and yours may not be described in this manual. In any
event, our technical support team is ready to answer your
quesons!
(503) 628-0838
(888) 818-2058 - Toll Free (USA ONLY)
www.rwls.com/how-to-calibrate-install/
FOLLOW US!
IMPORTANT!
Please read instrucons COMPLETELY and thoroughly before installaon. Right Weigh, Inc. is not
responsible or liable for any negave consequences as a result of improper installaon or
operaon including, but not limited to, product failure or damage that could affect the integrity of
the vehicle.
The installaon steps in this manual are for the sole use of trained installers. Right Weigh, Inc.
accepts no responsibility or liability for issues involving, but not limited to, incorrect installaon
that occur from misinterpretaon of the steps outlined in this document.
It is the end user’s responsibility to be aware of vehicle manufacturer policies before making
modificaons to the vehicle. Right Weigh, Inc. is not liable or responsible for issues regarding, but
not limited to, warranes with other manufacturers. This is the responsibility of the end user.
For a more detailed explanaon of the the warranty and liability of Right Weigh, Inc. please refer
to the “Warranty Statement” and “Return Policy & Repairs” secon of this document and
www.rwls.com/warranty.
Parts Requried
Specificaons & Overview
Scale Installaon
Calibraon and Operaon
Troubleshoong
Warranty Statement
Return Policy & Repairs
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5
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CONTENTS
3
These parts are included in the 310-RK (Retail Kit) products and are sold
separately in the 101-SK kit:
PARTS REQUIRED
4
Street Tee Fing
The thread size and type should match the
thread size and type of the vehicle suspension
Male NPT Tube for 1/4” Air Line
The thread size and type should match the
thread size and type of the vehicle suspension
Male Elbow Tube Fing for 1/4” Air Line
Tubing size to match the male straight air line
fing. 1/4“ NPT to match the thread size of
the fing at the boom of the load scale
1/4” Air Line
The amount of air line needed depends on
the mounng locaon of the gauge
SPECIFICATIONS & OVERVIEW
5
87 mm
7-¼”
184 mm
208 mm
Technical Specificaons
Operang/Storage Temperature: -40° F to +185° F (-40° C to +85° C)
Enclosure: Black Polypropylene
Gauge Size: 3.5”
114 mm
114 mm
406 mm
The 310-PP series is designed for use on an axle group with a single height control
valve suspension system. Within this series, there are different products designed for
different axle group configuraons. Before installaon, make sure you have the
proper gauge for your applicaon:
If you have the wrong gauge for your applicaon, please call our technical
support listed on page 2.
Gauge - Pounds (LBS) Gauge - Kilograms (KGS)Suspension
Single Axle
Tandem Axle
Tri Axle
310-30-PP
310-54-PP
*310-HKANT40K-PP
**310-54-RK
310-80-PP
310-16KG-PP
310-25KG-PP
310-30KG-PP
*For use with Hendrickson VANTRAAX HKANT 40K or ULTRAA-K UTKNT 40K air
suspension only
**Packaged kit including air line installaon components
6
The 310 Series gauge comes in a protecve box with a mounng bracket and
hardware. The following steps will walk you through how to correctly mount and
install the scale. Be sure to choose a locaon that is easily accessible and safe from
potenal damage (forkli posts, re caps, etc.)
DO NOT mount the scale directly to the chassis or any other main
beam unless it is approved by the vehicle manufacturer. Doing so
may void the warranty with the vehicle manufacturer.
MOUNT SCALE
DUMP AIR FROM SUSPENSION SYSTEM
2
1
Choose a locaon to mount the
scale that is easily accessible and
safe from potenal damage (forkli
posts, re caps, etc.). Mount the
bracket in the chosen locaon using
two bolts to secure it. Install the
gauge box to the bracket using
supplied hardware.
SCALE INSTALLATION
Make sure to use BOTH supplied mounng bolts to secure the
bracket to the vehicle. Using only one bolt can result in a cracked
bracket and the scale falling off the vehicle.
!
!
7
INSTALL NEW 1/4” AIR LINE & FITTING
4
Install a new 1/4” air line and fing
into the remaining port on the tee.
Remove the suspension air line fing from the top of one of the air bags.
Insert a street tee fing into the top of the air bag that matches the thread
size of the vehicle suspension. Reinstall the suspension air line and fing into
the street tee. For more informaon on the parts needed for air line
installaon, see page 4.
Air Bag
Street tee
tting
Air Bag
Air Bag
ROUTE AIR LINE TO GAUGE
5
Route the new 1/4” air line from the tee fing assembly to the gauge.
Secure air line with zip es. Install male elbow tube fing onto the
boom of the gauge. Insert the air line into the fing and ghten the
tube nut securely.
AIR UP SUSPENSION SYSTEM
6
Check for leaks and that all fing connecons are secure.
Pull red push/pull valve to check that air pressure is geng to the gauge.
SCALE INSTALLATION
TEE INTO AIR SUSPENSION
3
8
1: The vehicle must be fully loaded. For best results, calibrate with a loaded
weight within 1500lbs or 750kgs of your typical axle group weight (DO NOT
calibrate empty!)
2: Using a cerfied in-ground scale, obtain a loaded weight for the axle group
aached to the gauge.
3: Park on a level surface. Shi the transmission to neutral and set the parking
brakes.
4: Chock the wheels to prevent unexpected vehicle movement.
5: Release the parking brakes.
6: Make sure the Height Control Valve (HCV) has fully inflated the air bags. If
needed, briefly dump the air from the suspension and allow the HCV to refill
the system.
7: Pull the red push/pull valve so that it is in the fully open posion.
8: Using a flathead screwdriver, turn the calibraon screw on the dial face unl
the gauge matches the cerfied axle group weight.
CALIBRATION AND OPERATION
CALIBRATION
SCREW
1: Park on a level surface. Shi the transmission to neutral and set the parking
brakes.
2: Chock the wheels to prevent unexpected vehicle movement. Release the
parking brakes.
3: Make sure the Height Control Valve (HCV) has fully inflated the air bags. If
needed, briefly dump the air from the suspension and allow the HCV to refill
the system.
4: Pull the red push/pull valve so that it is in the fully open posion. View the
load scale to determine the on-the-ground axle group weight.
5: Push the push/pull valve so that it is in the full closed posion.
CALIBRATING
OPERATING AND WEIGHING
PUSH/PULL
VALVE
TROUBLESHOOTING
9
PROBLEM CAUSE SOLUTION
Errac / Inaccurate
Weight Readings
The vehicle is not parked on
a level surface
Park on level concrete ground.
Parking on sloped or banked
surfaces will cause the vehicle weight distribuon to shi
between the axle groups. Addionally,
if one or more of the
vehicle’s wheels are in a pothole, that could result in addional
pressure or torque on the suspension air bags. This will cause the
suspension to have a different air pressure than what is normally
needed to hold up the given weight.
The vehicle’s brakes are on
Release the parking brakes when weighing and/or calibrang.
When the vehicle brakes are set, they could apply addional
pressure or torque on the suspension air bags. This will cause the
suspension to have a different air pressure than what is normally
needed to hold up the given weight.
There is a significant air leak
in the suspension system
Check air lines for leaks. Having a leak could cause the
HCV to
refill the suspension at regular intervals to maintain the vehicle’s
ride height. If there is a significant leak, the gauge display will
slowly decrease in value and then quickly increase in value when
the HCV refills the suspension system.
The Height Control Valve
(HCV) is malfunconing or
broken
If the HCV is not funconing correctly, the air pressure applied to
the suspension system could be inconsistent and/or errac. To
test for an HCV problem, acquire a weight reading from the Right
Weigh gauge and write it down (refer to gauge operang
instrucons for proper procedure). Drive the vehicle around the
block and return to the same locaon. Acquire a second reading
from the Right Weigh gauge. If the two readings are significantly
different, then the HCV might be malfunconing.
Right Weigh is commied to providing quality products that funcon as intended, and we always
stand behind our workmanship. Our industry leading warranty is our best effort to express this
commitment. Products manufactured or sold by Right Weigh, Inc. are warraned to be free from
significant defects in material and workmanship 3 years from date of purchase. During this me, and
within the boundaries set forth in this warranty statement, Right Weigh, Inc. will, at its sole
discreon, correct the product problem or replace the product.
This warranty shall not apply to product problems resulng from: (1) Improper applicaon,
installaon, incorrect wiring, or operaon outside of the approved specificaons of the product. (2)
Accidents, faulty suspension parts or power surges (3) Inadequate maintenance or preparaon by
the buyer or user (4) Abuse, misuse, or unauthorized modificaon. (5) Acts of God, lightning strike,
floods, fire, earthquake, etc.
Right Weigh, Inc. assumes no responsibility or liability for any loss or damages resulng from use of
Right Weigh, Inc. products.
In no event shall Right Weigh, Inc. be liable for direct, indirect, special, incidental or consequenal
damages (including loss of profits or loss of me) resulng from the performance of a Right Weigh,
Inc. product. In all cases, Right Weigh, Inc. liability will be limited to the original cost of the product
in queson. Right Weigh, Inc. reserves the right to make improvements in design, construcon, and
appearance of products without noce.
WARRANTY
10
RETURN POLICY & REPAIRS
11
Return Policy and Authorizaon
Before returning any product, please obtain a Return Merchandise Authorizaon number (RMA#)
by calling Customer Service at 503-628-0838 or e-mailing [email protected]. Include the RMA#
and informaon regarding the reason for the return with the returned product. Shipping costs for
returns must be prepaid by the customer. For your protecon, items must be carefully packed to
prevent damage in shipment and insured against possible damage or loss. Right Weigh, Inc. will not
be responsible for damage resulng from careless or insufficient packing or loss in transit.
An RMA# must be obtained by the original purchaser before any product can be returned. Only
new, unused products may be returned. Installed, used, damaged, modified or customized products
can not be returned for credit. Credit will be issued to the original purchaser aer evaluaon by
Right Weigh, Inc.
Repairs/Replacements
An RMA# must be obtained before any product can be returned. Right Weigh, Inc. will evaluate
returned products at no charge. If Right Weigh, Inc. determines that the returned product is under
warranty it will repair the product or parts thereof at no charge, or if unrepairable, replace it with
the same or funconally equivalent product whenever possible. Right Weigh, Inc. will return the
product at its expense via a shipping method (carrier to be at sole discreon of Right Weigh, Inc.)
equal to or faster than the method used by the customer. Products or parts thereof not covered by
warranty will be repaired or replaced at customer expense upon authorizaon by the customer.
Right Weigh, Inc. will return the repaired product at customer expense via a shipping method
(carrier to be at sole discreon of Right Weigh, Inc.) equal to or faster than the method used by the
customer.
For addional support contact:
Right Weigh, Inc.
(503) 628-0838
(888) 818-2058 - Toll Free (USA ONLY)
www.rwls.com
©2015-2020 Right Weigh, Inc. All rights reserved.
Right Weigh, Inc.
Hillsboro, Oregon USA
PP-003-0000 Revision G
September 2020
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RW 310-PP Series onboard load scale offers precise axle group weight measurements for single, tandem, or tri-axle vehicles. It features a 3.5" analog gauge for easy readability, and its durable polypropylene enclosure ensures longevity. Installation is simple, involving mounting the gauge, connecting to the vehicle's air suspension, and calibrating using a certified in-ground scale. The scale aids in preventing overloading, optimizing load distribution, and increasing fuel efficiency.
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